{tag=Rank of a group}
{title2=$r$}
{wiki=Rank_of_an_elliptic_curve}

= Rank of the elliptic curve over the rational numbers
{synonym}

<Mordell's theorem> guarantees that <rank of a group>[the rank] (number of elements in the <generating set of the group>) is always well defined for an <elliptic curve over the rational numbers>. But as of 2023 there is no known algorithm which calculates the rank of any curve!

It is not even known if there are elliptic curves of every rank or not: <Largest known ranks of an elliptic curve over the rational numbers>, and it has proven extremely hard to find new ones over time.

TODO list of known values and algorithms? The <Birch and Swinnerton-Dyer conjecture> would immediately provide a stupid algorithm for it.


 Rank of an elliptic curve over the rational numbers